AngularJS: Basic example to use authentication in Single Page Application

Question

I am new to AngularJS and gone through their tutorial and got a feel for it.

I have a backend for my project ready where each of the REST endpoints need

Answer 1

var _login = function (loginData) {
 
        var data = "grant_type=password&username=" + loginData.userName + "&password=" + loginData.password;
 
        var deferred = $q.defer();
 
        $http.post(serviceBase + 'token', data, { headers: { 'Content-Type': 'application/x-www-form-urlencoded' } }).success(function (response) {
 
            localStorageService.set('authorizationData', { token: response.access_token, userName: loginData.userName });
 
            _authentication.isAuth = true;
            _authentication.userName = loginData.userName;
 
            deferred.resolve(response);
 
        }).error(function (err, status) {
            _logOut();
            deferred.reject(err);
        });
 
        return deferred.promise;
 
    };